Mare Dibaba

She won her country's first ever marathon gold medal at the World Championships.

Several former Boston winners are among the field of 36 elite runners.

There are eight men with sub-2:06 credentials, 12 women with sub-2:24 marks.

Thirteen men ran under 2:08, while three women broke 2:20.

She set a new course record by three tenths of a second.

He's dominated every race he's entered since Boston.